Prince William might have looked wide-awake at his wedding, but the Duke of Cambridge has revealed that he only got 30 minutes of sleep before the big day on April 29, 2011.

“[The crowds] were singing and cheering all night long,” the Duke explains in an interview for the iTV special “Elizabeth: Queen, Wife, Mother,” airing in the UK on June 1. “So the excitement of that, the nervousness of me and everyone singing — I slept for about half an hour.”

The Duke of Cambridge says that, while he seemed cool and collected at his nuptials, which were reportedly watched by 3 billion people around the globe, inside he was all nerves.

“The hardest thing was trying to walk down the stairs with my spurs on, sideways,” he said. “I had visions of myself and my brother [Prince Harry] colliding and crashing down the stairs.”

Prince William also shares that his grandmother, Queen Elizabeth II, was very accommodating when it came to the couple’s requests.

“There was very much a subdued moment when I was handed a list with 777 names on it — not one person I knew or Catherine knew,” the Duke recalls. “I went to [Queen Elizabeth] and said, ‘Listen, I’ve got this list, not one person I know — what do I do?’ And she went, ‘Get rid of it. Start from your friends and then we’ll add those we need to in due course. It’s your day.'”

Almost as soon as the Duke and Duchess walked down the aisle last year, speculation began about when the couple would have children. But Kate Middleton put bump watchers at bay last week, having a glass of champagne while toasting Queen Elizabeth at a Windsor Palace lunch late last week.